Astrophysics is the branch of astronomy that deals with the physics of the universe, including the physical properties (luminosity, density, temperature, and chemical composition) of celestial objects and the interstellar medium, as well as their interactions.
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Most research activities will either occur in academic departments or in research institutes (which may either be in universities or external). Both of these are included in this category.
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Please submit only websites that have English language content to this category. If your site is in a language other than English, please submit it to the appropriate category of World.